Re: on the need for documentation addresses of all types

Tim Chown <Tim.Chown@jisc.ac.uk> Mon, 27 February 2017 14:36 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Subject: Re: on the need for documentation addresses of all types
Thread-Topic: on the need for documentation addresses of all types
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Date: Mon, 27 Feb 2017 14:36:42 +0000
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On 27 Feb 2017, at 14:23, Michael Richardson <mcr+ietf@sandelman.ca>; wrote:
> 
> rfc3849 gives us 2001:DB8::/32 for use in documentation.
> 
> I find that I am often giving example addresses in fe80:: (Link Local), and
> fd00::/8 (ULA) addresses when those prefixes are appropriate for the
> protocol.   I worry that someone will think the numbers I've chosen are
> special in some way.  There are clearly far less concern about duplication
> since both spaces are designed to be duplicated (LL) and
> not-guaranteed-to-be-unique (ULA).

> I'd still be happier if someone google'ed the prefixes in the document, and
> found that they were documentation examples.

I guess it’s tricky to reserve any documentation range when those could be genuinely used anyway?

> I'd also like to have three additional documentation prefixes from GUA
> space so that examples involving inner and outer addresses, and senders and
> receivers could be better distinguished.  Yes, we currently can carve
> /48 blocks out of 2001:DB8::/32 for this purpose, but it would be nice if
> the pattern was even more unique.
> 
> Would it also be useful to have documentation addresses for the multicast
> ranges, and the like?

There are multicast documentation prefixes - see RFC 6676.

Tim